What is the difference between Go's custom types and built-in types for data storage and manipulation in Go?
In Go, a built-in type is a pre-defined type that is provided by the language itself, while a custom type is a user-defined type that is created using one or more built-in types.
Built-in types include common types such as integers, floating-point numbers, strings, and booleans, as well as more specialized types such as slices, maps, channels, and functions.
Custom types, on the other hand, are defined using the "type" keyword followed by a name and the underlying type. For example, we can define a custom type called "myInt" that is based on the built-in "int" type as follows:
type myInt int
Once we have defined a custom type, we can use it in place of the built-in type in our programs. For example, we can declare a variable of type "myInt" and assign it a value as follows:
var x myInt = 42
Custom types can also have methods associated with them, just like structs. This allows us to define custom behavior for our types, making them more powerful and expressive.
Overall, the main difference between built-in and custom types is that built-in types are provided by the language itself and have predefined behavior, while custom types are defined by the user and can have custom behavior defined using methods.